diff --git a/src/gui/wio/input.zig b/src/gui/wio/input.zig
index 3d968b56..0b43b78f 100644
--- a/src/gui/wio/input.zig
+++ b/src/gui/wio/input.zig
@@ -23,6 +23,11 @@ pub const Mods = packed struct(u8) {
             .super = pressed.has(.left_gui) or pressed.has(.right_gui),
         };
     }
+
+    /// True only when shift is the sole active modifier.
+    pub fn shiftOnly(self: Mods) bool {
+        return self.shift and !self.alt and !self.ctrl and !self.super and !self.hyper and !self.meta;
+    }
 };
 
 // Simple set of currently held buttons (for modifier tracking)
@@ -54,58 +59,58 @@ pub const KeyEvent = struct {
 // Map a wio.Button to the primary codepoint for that key
 pub fn codepointFromButton(b: wio.Button, mods: Mods) u21 {
     return switch (b) {
-        .a => if (mods.shift) 'A' else 'a',
-        .b => if (mods.shift) 'B' else 'b',
-        .c => if (mods.shift) 'C' else 'c',
-        .d => if (mods.shift) 'D' else 'd',
-        .e => if (mods.shift) 'E' else 'e',
-        .f => if (mods.shift) 'F' else 'f',
-        .g => if (mods.shift) 'G' else 'g',
-        .h => if (mods.shift) 'H' else 'h',
-        .i => if (mods.shift) 'I' else 'i',
-        .j => if (mods.shift) 'J' else 'j',
-        .k => if (mods.shift) 'K' else 'k',
-        .l => if (mods.shift) 'L' else 'l',
-        .m => if (mods.shift) 'M' else 'm',
-        .n => if (mods.shift) 'N' else 'n',
-        .o => if (mods.shift) 'O' else 'o',
-        .p => if (mods.shift) 'P' else 'p',
-        .q => if (mods.shift) 'Q' else 'q',
-        .r => if (mods.shift) 'R' else 'r',
-        .s => if (mods.shift) 'S' else 's',
-        .t => if (mods.shift) 'T' else 't',
-        .u => if (mods.shift) 'U' else 'u',
-        .v => if (mods.shift) 'V' else 'v',
-        .w => if (mods.shift) 'W' else 'w',
-        .x => if (mods.shift) 'X' else 'x',
-        .y => if (mods.shift) 'Y' else 'y',
-        .z => if (mods.shift) 'Z' else 'z',
-        .@"0" => if (mods.shift) ')' else '0',
-        .@"1" => if (mods.shift) '!' else '1',
-        .@"2" => if (mods.shift) '@' else '2',
-        .@"3" => if (mods.shift) '#' else '3',
-        .@"4" => if (mods.shift) '$' else '4',
-        .@"5" => if (mods.shift) '%' else '5',
-        .@"6" => if (mods.shift) '^' else '6',
-        .@"7" => if (mods.shift) '&' else '7',
-        .@"8" => if (mods.shift) '*' else '8',
-        .@"9" => if (mods.shift) '(' else '9',
+        .a => if (mods.shiftOnly()) 'A' else 'a',
+        .b => if (mods.shiftOnly()) 'B' else 'b',
+        .c => if (mods.shiftOnly()) 'C' else 'c',
+        .d => if (mods.shiftOnly()) 'D' else 'd',
+        .e => if (mods.shiftOnly()) 'E' else 'e',
+        .f => if (mods.shiftOnly()) 'F' else 'f',
+        .g => if (mods.shiftOnly()) 'G' else 'g',
+        .h => if (mods.shiftOnly()) 'H' else 'h',
+        .i => if (mods.shiftOnly()) 'I' else 'i',
+        .j => if (mods.shiftOnly()) 'J' else 'j',
+        .k => if (mods.shiftOnly()) 'K' else 'k',
+        .l => if (mods.shiftOnly()) 'L' else 'l',
+        .m => if (mods.shiftOnly()) 'M' else 'm',
+        .n => if (mods.shiftOnly()) 'N' else 'n',
+        .o => if (mods.shiftOnly()) 'O' else 'o',
+        .p => if (mods.shiftOnly()) 'P' else 'p',
+        .q => if (mods.shiftOnly()) 'Q' else 'q',
+        .r => if (mods.shiftOnly()) 'R' else 'r',
+        .s => if (mods.shiftOnly()) 'S' else 's',
+        .t => if (mods.shiftOnly()) 'T' else 't',
+        .u => if (mods.shiftOnly()) 'U' else 'u',
+        .v => if (mods.shiftOnly()) 'V' else 'v',
+        .w => if (mods.shiftOnly()) 'W' else 'w',
+        .x => if (mods.shiftOnly()) 'X' else 'x',
+        .y => if (mods.shiftOnly()) 'Y' else 'y',
+        .z => if (mods.shiftOnly()) 'Z' else 'z',
+        .@"0" => if (mods.shiftOnly()) ')' else '0',
+        .@"1" => if (mods.shiftOnly()) '!' else '1',
+        .@"2" => if (mods.shiftOnly()) '@' else '2',
+        .@"3" => if (mods.shiftOnly()) '#' else '3',
+        .@"4" => if (mods.shiftOnly()) '$' else '4',
+        .@"5" => if (mods.shiftOnly()) '%' else '5',
+        .@"6" => if (mods.shiftOnly()) '^' else '6',
+        .@"7" => if (mods.shiftOnly()) '&' else '7',
+        .@"8" => if (mods.shiftOnly()) '*' else '8',
+        .@"9" => if (mods.shiftOnly()) '(' else '9',
         .space => ' ',
         .enter => '\r',
         .tab => '\t',
         .backspace => 0x7f,
         .escape => 0x1b,
-        .minus => if (mods.shift) '_' else '-',
-        .equals => if (mods.shift) '+' else '=',
-        .left_bracket => if (mods.shift) '{' else '[',
-        .right_bracket => if (mods.shift) '}' else ']',
-        .backslash => if (mods.shift) '|' else '\\',
-        .semicolon => if (mods.shift) ':' else ';',
-        .apostrophe => if (mods.shift) '"' else '\'',
-        .grave => if (mods.shift) '~' else '`',
-        .comma => if (mods.shift) '<' else ',',
-        .dot => if (mods.shift) '>' else '.',
-        .slash => if (mods.shift) '?' else '/',
+        .minus => if (mods.shiftOnly()) '_' else '-',
+        .equals => if (mods.shiftOnly()) '+' else '=',
+        .left_bracket => if (mods.shiftOnly()) '{' else '[',
+        .right_bracket => if (mods.shiftOnly()) '}' else ']',
+        .backslash => if (mods.shiftOnly()) '|' else '\\',
+        .semicolon => if (mods.shiftOnly()) ':' else ';',
+        .apostrophe => if (mods.shiftOnly()) '"' else '\'',
+        .grave => if (mods.shiftOnly()) '~' else '`',
+        .comma => if (mods.shiftOnly()) '<' else ',',
+        .dot => if (mods.shiftOnly()) '>' else '.',
+        .slash => if (mods.shiftOnly()) '?' else '/',
         // Navigation keys map to special Unicode private-use codepoints
         // that Flow's input layer understands (matching kitty protocol).
         .up => 0xF700,